Virulence for chick embryos of Escherichia coli from cattle. 3. Isolation of an avirulent variant from a virulent strain.
D000818:Animals; D002417:Cattle; D002642:Chick Embryo; D003470:Culture Media; D004926:Escherichia coli / Q000472:pathogenicity*; D013696:Temperature; D014774:Virulence
D003470:Culture Media